spadefish vs percoid

spadefish and percoid both are nouns.

Word	Noun	Adjective	Verb	Adverb
spadefish	Yes	No	No	No
percoid	Yes	No	No	No

As nouns, percoid is a hypernym of spadefish; that is, percoid is a word with a broader meaning than spadefish:

spadefish: deep-bodied disk-shaped food fish of warmer western Atlantic coastal waters
percoid: any of numerous spiny-finned fishes of the order Perciformes

Other hypernyms of spadefish include percoid fish, percoidean.

spadefish (noun)	percoid (noun)
deep-bodied disk-shaped food fish of warmer western Atlantic coastal waters	any of numerous spiny-finned fishes of the order Perciformes